Cutting-off saw



(No Model.) 2 Sheets-Sheet 1. A. M. EASTMAN & J. R. THOMAS.

CUTTING OFF SAW.

No. 371,676. Patented Oct. 18 887.

' ATTORNEY WITNESSES:

N. PETERS. mlmuuw ra hav. wuhinpm an (No Model.)

2 Sheets-Sheet 2. A. M. EASTMAN & J. R. THOMAS.

CUTTING OFF SAW. No. 371,676. I Patented Oct. 18, 1887.

ATTORNEY n. PETERS. Phalo-Lnhugraphen Wnmngmm n. C.

UNITED STATES PATENT OFFICE.

ANDREW M. EASTMAN, OF MILFORD, AND JOHN R. THOMAS, OF BOSTON, MASSACHUSETTS, ASSIGNORS TO THE S. A. \VOODS MACHINE COMPANY,

OF MASSACHUSETTS.

CUTTING-OFF SAW.

SPECIFICATION forming part of Letters Patent No. 371,676, dated October 18, 1887.

(No model.)

To aZZ whom it may concern:

Beit known thatwe, ANDREW M. EASTMAN, of Milford, in the county of Worcester and State of Massachusetts, and J OHN R. THOMAS,

of Boston, in the county of Suffolk and State of Massachusetts, haveinvented a certain new and useful Improvementin Cutting-Off Saws, of which the following is a specification.

Our improvement relates to swinging saws 1:) for cutting off timber, lumber, 8m. and it consists in certain new. and improved constructions and'combinations of the same, substantially as hereinafter described and claimed.

In the drawings, Figure l is a side elevation I5 of a saw-bench provided with a cutting-off saw and our improvements relating thereto. Fig. 2 is a top plan view of the same with the saw-- table partly broken away to show the construction ofthe working parts. Fig. 3 is an end view of the same. Fig. 4 is an enlarged View of a portion of the opposite side of the machine from that shown in Fig. 1. Fig. 5is an end view of Fig. 4, partlyin section on line a a, showing details of construction.

A is the frame of the machine, which is of a rectangular form, as usual, and has the table A placed horizontally on top of it. This table receives the lumber to be cut off.

S is the saw, which is attached as shown,

mounted upon the outer ends of the arms 8 s in boxes. These arms are pivoted at their lower ends to the ends of another pair ofarms, s s. The arms 8' s are in turn pivoted upon the shaft or axle I), supported in boxes on the side rails of frame A, as shown in the drawings. The boxes at the outer ends of the arms 8 s have attached to them guide-pieces c on each side, which fit on ways 0 and slide back and forth thereon horizontally, allowing the saw to be traversed forward to the position shown by dotted lines in Fig. l and drawn back again at will.

In order to drive the saw while being moved back and forth in the operation of cutting off the lumber, a pulley, p, is attached to its shaft between the boxes, and another pulley, p, is attached to the pivot or shaft which joins the arms 8 s and s 8 together, so as to revolve thereon. A larger pulley, B, is attached to the central portion of the shaft 2), and a tight and loose pulley, B B, is attached to the outer end of the same shaft, and receives its motion by a belt from any suitable counter-shaft. Upon the upper sides of the arms 8 s are at tached ears s 8 and pivoted to these cars are arms 8 8 extending toward the arms 8. The other ends of the arms .9 are connected by a shaft, upon which is mounted loosely the pulley p Another shaft rigidly fixed in the arms s s and extending transversly across the machine between them carries upon it the bracket d, which supports the weight d on the top of the bracket, which is in the form of a bar parallel to the arms 8 By sliding this weight d along on the bracket toward the ears 8 or away from them it will diminish or increase its pressure upon the outer ends of those arms and the pulley p as desired. The weight is held upon the bracket in the desired position bya set-screw. A belt, 6, is carried around the driving-pulleyB underneath the idler-pulleyp over the pulleyp ofthe saw-shaft, around and underneath the pulleyp at thejunction of the arms, and back to pulley B. The tension of the pulleyp upon this belt keeps it taut, no matter what the position of the saw may be in sliding back and forth upon the ways 0, and thus enables the saw to be driven by the belt 6 with the same tension at all parts of its traverse.

Our improvement in this mechanism consists in attaching the idler-pulley p to the arms 8 pivoted upon the arms 8 and extend ing horizontally over the same, as shown,thus enabling us to apply the weight d to these arms 8 and increasing or diminishing thetension of the idler-pulley 19 upon the belt at pleasure. v

In cutting off extremely large or hard tim her it is frequently desirable to have the saw moved forward to the position shown in dotted lines by the power of the driving machinery, and it is also desirable to be able to stop the forward movement of the saw at any desired point and allow it to retire, thus making a partial cut of any desired depth in the timber.

To draw back the saw to the position shown in Fig. 1, a strap, 0 is attached to a cross-bar connecting the sliding pieces a, and this strap is carried around the drum and has its other end made fast thereto. 0 extends transversely across the frame andis mounted in bearings thereon, as shown, and has the gear-wheel 0 attached to one end of it. This gear-wheel meshes with the gear 0 attached to the drum 0, around which a cord is wound and attached thereto at one end, and a weight, 0', is attached to the other end ofsuch cord. vAs the gear-wheel c is smaller than its drum 0 and smaller than the gear-wheel c ,the

movement of the weight up and down in drawing the saw back is much less in distance than the movement of the saw, and all necessity of having the weight pass through the floor on which the machine rests is thereby obviated.

For-drawing the saw forward in cutting off timber the following mechanism is employed: Upon the opposite end of the shaftb from the tight and loose pulleys isattached a pulley,B, in line with a pulley, B, which is upon the outer end of the shaft b The latter is mounted in bearings in the frame of the machine and extends transversely across it. A drum, d is mounted loosely upon this shaft and has a flange, (1, attached thereto. extends from one of the arms 8 around this drum and is. made fast thereto. A corresponding flange, d to that lettered d is made fast to shaft b these flanges being face to face. A collar, (1 is mounted loosely upon shaft b, having one face bearing against the drum (2 and a projecting portion or hub,d ,attached to the other end of it, which is flattened on two sides. The face of the collar d where the hub djoins it, is inclined to its axis, and a wedge, (i is made to enter between this face and the frame A of the machine, and receive in a slot within it the hub d so as to prevent the latter and the collar d from revolving with the shaft. Alink, d, is attached to the lower end ofthis wedge by a pivot,and a treadle, 01, is attached to the lower end of this link, by a .pivot,d. This treadle is in suitable position for the foot of the 0perat0r,and by pressing upon it the link d and wedged arelifted, and the collar d is compressed against the drum d closing the flanges d d firmly together and cansing the drum d to revolve with the shaft'b. This draws upon the strap (1* and carries the saw forward. By releasing the treadle d at any time in the forward movement of the saw the latter willbeinstantly released and drawn back bythe weight a.

What we claim as new and of our invention 1. The combination of the jointed arms s s,

The shaft of the drum A strap, d, r

pivoted to the frame and to each other, the saw S,mounted upon the free end ofarmss and provided with a driving-pulley, p, the pulley 10, mounted on the pivot connecting arms 8 s, the pulley B, mounted on the shaft 1), and the arms s ,pivoted to the arms s,extending hori- .vided with strap d", connecting it to said guides and saw and clutch mechanism provided with a foot-pedal and adapted to clutch said drum to said shaft and release the same therefrom at any desired point in the winding of said strap upon said drum, substantially as described.

b the drum d, arranged to turn loosely, provided with strap d,connectingit to said guides and saw, and clutch mechanism adapted to clutch said drum to said shaft and release the same therefrom at any desired point in the winding of said strap upon said drum,and the strap cidrum c,and weight a, connected therewith, adapted to withdraw said saw when so released, substantially as described.

4. The combination of the frame A, provided with guidcways, the saw S, mounted upon guides thereon, the shalt b mounted in said frame,the drum dflprovided with strap d, con.- nected to said saw-g uides,the collar diattached to said shaft on one side of said drum, and the-collar d and wedge d,e1nbracing said shaft and adapted to clutch said drum and collar d together, substantially as described.

5. The combination of frame A, provided with gui'deways, the saw S, mounted on guides thereon, the drum 0", provided with strap 0 connected to said guides, and the drum 0 and its weight c ,connected by a strap or cord therewith, said drum 0 being connected to drum 0 by gearing adapted to cause said strap 0" to be wound and unwound thereon more rapidly than the strap of weight 0 is wound upon its drum,and said drum 0 and its gear 0 being located below the bed of the machine, substantially as described.

ANDREW M. EASTMAN.

JOHN R. THOMAS. .Wit'nesses:

DAVID HALL Bron, S. A. WooDs. 

